Rab is not popular as a baby name for boys. It is not in the top 1000 names. Among the group of boy names directly related to Rab, Robert was the most frequently used in 2015.
Baby names that sound like Rab include Raf (English), Raff (English), Ralf (English, German, Hungarian, and Scandinavian), Ralph (English and German), Raph, Raufe, Rauff, Rauffe, Rav, Reave (English), Reb, Rebe, Reefe (Scottish), Reeve (English), Reive, Reve, Rif, Rip (English), Ripp (English), and Riv.
† Pronunciation for Rab: R as in "race (R.EY.S)" ; AE as in "at (AE.T)" ; B as in "be (B.IY)"